Accelerometer issues - Page 3 - Electronic Circuits Projects Diagrams Free

ericgibbs · 20th May 2008, 07:02 AM

Quote:

Originally Posted by jacob.zurasky

Any luck with it?

hi Jacob,
Did you determine the "2500" output of the accelerometer to be in uSecs.?

I have not got an 'acc' on the bench, so I will have to make up an external circuit, probably using a dual mono HEF4528.

jacob.zurasky · 20th May 2008, 07:55 AM

I originally assumed that, but then looking into the basic stamp usage of PULSIN, I found that it returned values in 10uS increments. So, 2500 = 25000uS = 25mS at level position. 31.25mS max position and 18.75mS min position.

ericgibbs · 20th May 2008, 08:00 AM

Quote:

Originally Posted by jacob.zurasky

I originally assumed that, but then looking into the basic stamp usage of PULSIN, I found that it returned values in 10uS increments. So, 2500 = 25000uS = 25mS at level position. 31.25mS max position and 18.75mS min position.

Many thanks.

ericgibbs · 20th May 2008, 12:03 PM

hi atomsoft,

Looking at the accelerometer, you require two axis.
I have written a 'polling' program using Timer1 with PORTA.7 and 6 for the high pulse inputs of X and Y, it works OK.

Timer1 prescaler is set for 1:2 so with a 8MHz xtal you get a 1uSec count cycle.
As the 'acc' resolution is in mSec, even with this port/pin polling method the accuracy is good.

Attached a jpg of the Oshonsoft simulation.
I clicked PORTA 7 and 6 pins to give a 'high'.

If you would like me to post the program, just say.

AtomSoft · 20th May 2008, 01:05 PM

cool! sorry i havent been on lately just having major pc issues spent all day yesterday backing up all my important data now i have to reinstall windows xp today. So please just bare with me. Thanks for all the help and patience guy! Your all great!

ericgibbs · 20th May 2008, 01:33 PM

hi atom,

Attached two programs.
AccPoll3.asm has LCD subr.

When you have reinstalled the Windows XP into your PC, get a free copy of 'hard drive clone'..
using say a spare 40gByte drive, you can make a clone of the hard drive.

For future crashes, just clone the 'backup' clone to the new drive.
If you keep the cloned backup, upto date, its just a few minutes to get back to normal
as all your working programs and data have been cloned.

AtomSoft · 20th May 2008, 02:21 PM

Quote:

Originally Posted by ericgibbs

hi atom,

Attached two programs.
AccPoll3.asm has LCD subr.

When you have reinstalled the Windows XP into your PC, get a free copy of 'hard drive clone'..
using say a spare 40gByte drive, you can make a clone of the hard drive.

For future crashes, just clone the 'backup' clone to the new drive.
If you keep the cloned backup, upto date, its just a few minutes to get back to normal
as all your working programs and data have been cloned.

Cool i actually have a spare 80 but my HD is 250GB and it would be a long pain to clone it but since im going to format it will only take like 7gb of space and ill clone then

ericgibbs · 20th May 2008, 02:39 PM

Quote:

Originally Posted by AtomSoft

Cool i actually have a spare 80 but my HD is 250GB and it would be a long pain to clone it but since im going to format it will only take like 7gb of space and ill clone then

Hi,
I use the Seagate HD Wizard, from their website, get the version you can save on a CD.

futz · 20th May 2008, 02:49 PM

Quote:

Originally Posted by ericgibbs

I use the Seagate HD Wizard, from their website, get the version you can save on a CD.

I plug in the nearest Linux live disk I have at hand and use dd. It's dead simple to use and does a great job. It will copy any disk of any OS, damaged or not (if disk is damaged, set ignore error option), it doesn't care. It does a raw level copy, not file level. It's free and open source.

AtomSoft · 20th May 2008, 07:22 PM

any links on this linux live disk futz?

AtomSoft · 20th May 2008, 09:42 PM

Ok PC now up and running 100% Going to try your code now eric

AtomSoft · 20th May 2008, 10:26 PM

Should the INTIO1 be INTIO2 tho?

7. INTIO1 Internal Oscillator with FOSC/4
output on RA6 and I/O on RA7
8. INTIO2 Internal Oscillator with I/O on RA6
and RA7

Also i edited code but still some issue gonna try something brb

Code:

;May2008 Atomsoft
;Polling Accelerometer X and Y axis, using PORTA.7 and PORTA.6
;Timer1 holds the count equal to the time A.7 or A.6 are high
;The count is then transferred to XaxisH/L and YaxisH/L
;No LCD display on this version, so delays in the program.

	list    p=18F1320
	include	<p18F1320.inc>
	CONFIG	OSC = INTIO2, WDT = OFF, LVP = OFF, DEBUG = ON
	

XaxisH EQU 0x14
XaxisL EQU 0x15
YaxisH EQU 0x16
YaxisL EQU 0x17

				
	org	0x00
	goto	Init	;go to start of main code

	ORG	0x0008	;High priority interrupt vector
	retfie
	ORG	0x0018	;low priority interrupts
	retfie

Init:
	movlw	0x72	; 8MHz clock select
    	movwf	OSCCON
	clrf	TRISB	;PORTB all outs
	bsf		TRISA, 6
	bsf		TRISA, 7
	
	movlw 0x10	;prescaler 1:2, 8MHz xtal, so 1uSec clock
	movwf T1CON	;stop TMR1

Main:
	Call Read_X
	Call Read_Y
	nop
	;LCD subr goes here

	goto Main

Read_X: 	;if PORTA.7 already High, then wait for low
	btfsc 	PORTA,7
	return
WaitA7_Hi:	;wait for PORTA.7 to go high
	btfss 	PORTA,7
	goto	WaitA7_Hi
	bsf 	T1CON,TMR1ON	;start TMR1
WaitA7_Lo:
	btfsc 	PORTA,7
	goto	WaitA7_Lo

	bcf 	T1CON,TMR1ON	;stop TMR1
	;
	movf 	TMR1H,W		;read TMR1 and save count
	movwf 	XaxisH
        movf 	TMR1L,W
	movwf 	XaxisL
	clrf 	TMR1H
	clrf 	TMR1L
	return


Read_Y:		;if PORTA.6 already High, then wait for low
	btfsc 	PORTA,6
	return
WaitA6_Hi:	;wait for PORTA.6 to go high
	btfss 	PORTA,6
	goto	WaitA6_Hi
	bsf 	T1CON,TMR1ON
WaitA6_Lo:
	btfsc 	PORTA,6
	goto	WaitA6_Lo

	bcf 	T1CON,TMR1ON
	;
	movf 	TMR1H,W
	movwf 	YaxisH
        movf 	TMR1L,W
	movwf 	YaxisL
	clrf 	TMR1H
	clrf 	TMR1L
	return


	End

For some reason my watch window doesnt let me put the variable in it...

AtomSoft · 20th May 2008, 10:38 PM

i does in fact get a much steady result maybe like 3a-3e result jumps which is awesome .. Will post some extra code when done making it

AtomSoft · 20th May 2008, 11:11 PM

Actually varies about digits so 1-8 tops per digit tho like on meter its

2.49v reads
L:0x84-0x8A
H:0x13

2.50v
L:0x98-0x9C
H:0x13

2.51v reads
L:0xA7-0xAE
H:0x13

code:

Code:

;May2008 Atomsoft
;Polling Accelerometer X and Y axis, using PORTA.7 and PORTA.6
;Timer1 holds the count equal to the time A.7 or A.6 are high
;The count is then transferred to XaxisH/L and YaxisH/L
;No LCD display on this version, so delays in the program.

	list    p=18F1320
	include	<p18F1320.inc>

	CONFIG	OSC = INTIO2, WDT = OFF, LVP = OFF, DEBUG = ON
	

XaxisH EQU 0x14
XaxisL EQU 0x15
YaxisH EQU 0x16
YaxisL EQU 0x17

				
	org	0x00
	goto	Init	;go to start of main code

	ORG	0x0008	;High priority interrupt vector
	retfie
	ORG	0x0018	;low priority interrupts
	retfie

Init:
	movlw	0x72	; 8MHz clock select
    movwf	OSCCON
	clrf	TRISB	;PORTB all outs
	bsf		TRISA, 6
	bsf		TRISA, 7
	
	movlw 0x10	;prescaler 1:2, 8MHz xtal, so 1uSec clock
	movwf T1CON	;stop TMR1

Main:
	Call Read_X
    Call Read_Y
	nop

	goto Main

Read_X: 	;if PORTA.7 already High, then wait for low
	btfsc 	PORTA,7
	return
WaitA7_Hi:	;wait for PORTA.7 to go high
	btfss 	PORTA,7
	goto	WaitA7_Hi
	bsf 	T1CON,TMR1ON	;start TMR1
WaitA7_Lo:
	btfsc 	PORTA,7
	goto	WaitA7_Lo
	bcf 	T1CON,TMR1ON	;stop TMR1
	movf 	TMR1H,W		;read TMR1 and save count
	movwf 	XaxisH
    movf 	TMR1L,W
	movwf 	XaxisL
	clrf 	TMR1H
	clrf 	TMR1L
	return


Read_Y:		;if PORTA.6 already High, then wait for low
	btfsc 	PORTA,6
	return
WaitA6_Hi:	;wait for PORTA.6 to go high
	btfss 	PORTA,6
	goto	WaitA6_Hi
	bsf 	T1CON,TMR1ON
WaitA6_Lo:
	btfsc 	PORTA,6
	goto	WaitA6_Lo
	bcf 	T1CON,TMR1ON
	movf 	TMR1H,W
	movwf 	YaxisH
    movf 	TMR1L,W
	movwf 	YaxisL
	clrf 	TMR1H
	clrf 	TMR1L
	return


	End

blueroomelectronics · 20th May 2008, 11:45 PM

Use the Add Symbol button to add a watch variable.

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20th May 2008, 07:55 AM	(permalink)
jacob.zurasky	I originally assumed that, but then looking into the basic stamp usage of PULSIN, I found that it returned values in 10uS increments. So, 2500 = 25000uS = 25mS at level position. 31.25mS max position and 18.75mS min position. Last edited by jacob.zurasky; 20th May 2008 at 07:57 AM.

20th May 2008, 01:05 PM	(permalink)
AtomSoft	cool! sorry i havent been on lately just having major pc issues spent all day yesterday backing up all my important data now i have to reinstall windows xp today. So please just bare with me. Thanks for all the help and patience guy! Your all great! __________________ My YouTube Videos! My Favorite Stores: dipmicro Electronics SparkFun Electronics Futurlec BG Micro

20th May 2008, 07:22 PM	(permalink)
AtomSoft	any links on this linux live disk futz? __________________ My YouTube Videos! My Favorite Stores: dipmicro Electronics SparkFun Electronics Futurlec BG Micro

20th May 2008, 09:42 PM	(permalink)
AtomSoft	Ok PC now up and running 100% Going to try your code now eric __________________ My YouTube Videos! My Favorite Stores: dipmicro Electronics SparkFun Electronics Futurlec BG Micro

20th May 2008, 10:38 PM	(permalink)
AtomSoft	i does in fact get a much steady result maybe like 3a-3e result jumps which is awesome .. Will post some extra code when done making it __________________ My YouTube Videos! My Favorite Stores: dipmicro Electronics SparkFun Electronics Futurlec BG Micro Last edited by AtomSoft; 20th May 2008 at 10:39 PM.

20th May 2008, 11:45 PM	(permalink)
blueroomelectronics	Use the Add Symbol button to add a watch variable. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com